<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{ city }}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <ul class="button-list">
          <li class="button-wrapper"
            v-for="city of hotCities"
            :key="city.id"
            @click="handleCityClick(city.name)">
            <div class="button">{{ city.name }}</div>
          </li>
        </ul>
      </div>
      <div class="area"
        v-for="(value, key) in cities"
        :key="key"
        :ref="key">
        <div class="title border-topbottom">{{ key }}</div>
        <ul class="item-list">
          <li class="item border-bottom"
            v-for="item of value"
            :key="item.id"
            @click="handleCityClick(item.name)">
            {{ item.name }}
          </li>
        </ul>
      </div>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hotCities: Array,
    cities: Object,
    letter: String
  },
  computed: {
    ...mapState(['city'])
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  watch: {
    letter (newLetter) {
      const element = this.$refs[newLetter][0]
      this.scroll.scrollToElement(element)
    }
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .border-topbottom
    &:before
      border-color #ccc
    &:after
      border-color #ccc
  .list
    overflow hidden
    position absolute
    top 1.58rem
    left 0
    right 0
    bottom 0
    .title
      line-height .54rem
      padding-left .2rem
      color #666
      background #eee
    .button-list
      overflow hidden
      padding .1rem .6rem .1rem .1rem
      .button-wrapper
        float left
        width 33.33%
        background #fff
        .button
          border .02rem solid #ccc
          border-radius .06rem
          margin .1rem
          padding .1rem 0
          text-align center
    .item-list
      padding-left .2rem
      .item
        line-height .64rem
        color #666
</style>
